Things have sped up significantly (single threaded dbench, for example, is almost twice as fast), and overall things are much less vulnerable to obscure race conditions. MDS clustering is somewhat more stable (although still not stable enough to be recommended . The most bug fixes, though, are in the distributed object storage layer’s failure recovery and data migration code. The next release is mostly going to focus on object storage. We are cleaning up the interfaces and building a ‘librados’ (RADOS is the name for the object storage cluster) that provides a simple storage interface similar to S3. More on that soon!